A passionate spark of frenemy-bromance between the Man of Steel and the Caped Crusader was famously created in the last DC adventure, Batman Vs Superman: Dawn of Justice, when these two legends discovered their mums had the same first name: Martha. That somewhat anticlimactic coincidence was widely considered to be indicative of something unconvincing in the whole project. The problems are still evident.

This new film has had a troubled passage. Its original director, Zack Snyder, had to step aside after a family tragedy and Joss Whedon took over, reportedly reshooting between 15 and 20% of the film, a segment which may or may not have included the ending. It’s an unhappy state of affairs that may account for the film’s tendency towards shapelessness. Or this may have been a function of the ensemble structure and an uncertain handling of Batman’s new, more respectable and collegial role within the League.

We are now a few months on from Superman’s awful fate and huge, sombre banners hang on public monuments all over the world, including Tower Bridge in London. People everywhere are thoroughly depressed and demoralised. Then it becomes very clear that a terrible new threat to Planet Earth is materialising: a grotesque force of evil and destruction in the form of Steppenwolf (played in digital motion capture by Ciarán Hinds).

Bruce Wayne (Ben Affleck) who in costume and mask is still being called that primitive prototypical name “the bat man” and still going into the deep voice, even in front of people who already know who he is, persuades Diana Prince, otherwise known as Wonder Woman – and enjoyably played by Gal Gadot – that a crack new supergroup should be assembled under their joint command. Metahumans need to be recruited. They will be the lightning-fast Barry Allen, or the Flash (Ezra Miller), the technohuman hybrid Victor Stone or Cyborg (Ray Fisher) and Arthur Curry, or Aquaman, played with muscular and humorous panache by Jason Momoa, from Game of Thrones. He is the kind of exotic undersea creature that David Attenborough might discover in Blue Planet II.

Meanwhile Lois Lane (Amy Adams) mopes listlessly about the Daily Planet newsroom doing dull human interest stories and Bruce’s manservant Alfred (Jeremy Irons) is even less the traditional below-stairs figure of old, now more a silver-fox computer whiz who says things like: “What the hell?” But everyone must put aside their differences and worries to fight together against the wicked invader – in honour of Superman.

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Momoa brings some punch and humour to this film, especially with Aquaman’s inadvertent confession of a certain tendresse for Wonder Woman, and Ezra Miller does his best with the Flash, whose job it is to provide the nerdy, incredulous, alienated humour. Ray Fisher, too, does his best with a figure half-hidden in hi-tech armour.

But Ben Affleck is unrelaxed and ill-at-ease in the role of Batman/Bruce, unconvincing in both the bat armour and the three-piece suit of the wealthy plutocrat. “What’s your superpower?” asks The Flash and Bruce replies: “I’m rich.” It feels a bit late for this film to have cottoned on to a daringly heretical Batman joke that people have been making for years. Really, Affleck spreads a pall of dullness over the film. He doesn’t have the implacable, steely ferocity and conviction that Christian Bale had; he seems to have a faint sheen of sweat, as if the Batcave thermostat is up too high, and his attempts at droll humour and older-generation wisdom make his Batman look stately and marginal. Maybe we should get George Clooney back for the role.

It falls to Gal Gadot’s Wonder Woman to cheer things up a little, especially early on, with her dramatic intervention in London against a bunch of self-declared “reactionary terrorists” who invade the Old Bailey and threaten an explosion with a bomb attached to a timer device with the traditional LCD countdown display. It will, they say, cause devastation for “four city-blocks”. (City blocks? What city are we in, again?) Wonder Woman winds up posing, with great aplomb, atop the justice statue. A nice touch. It is Wonder Woman who provides the link to the ancient world, and with it the surreality and exoticism.

In the end, though, there is something ponderous and cumbersome about Justice League; the great revelation is very laborious and solemn and the tiresome post-credits sting is a microcosm of the film’s disappointment. Some rough justice is needed with the casting of this franchise.